Try switching to one of the default WordPress themes – if the problem goes away, there is something specific to your theme that may be interfering with Total Donations. Most of the time it is a CSS issue caused by a theme that hides the radio buttons by default. We test with a wide variety of themes before every release but due to the countless themes and variations, it is impossible to guarantee it will work flawless with every theme. Thankfully most themes work out of the box or only require a few tweaks.
Make sure you are using the latest version of Total Donations by checking the version number under Plugins > Installed Plugins and comparing it with the version number on WordPress.org.